I guess the title of the topic pretty much says it all, so basically i'm looking brutal thrash metal bands similar to demolition hammer, couldn't find any similar band to them so far, so that's why i need your help guys

Not that you needed another person to mention them, but Morbid Saint fucking rules, check out Spectrum of Death, just listen to the full album.

Somewhat similar to Morbid Saint but a bit less hammering and percussive, check out Acrophet. Both albums are good - hammering and aggressive thrash.

Merciless are somewhat similar, though a bit more deathy. The two demos, "Behind the Black Door" and "Realm of the Dark" are amazing, and their debut "The Awakening" rounds up their early era of being relentless extreme thrash with riffs and some more riffs and then some riffs. Those three should be what you're looking for here, perhaps not quite as percussive as DH. They evolved a bit after that, I reviewed everything in their discography if you want to find out about the other stuff.

Multiple Stab Wounds (MSW) came from a few miles east of DH and put out a few demos in the 80s. They never had the production to be quite as hammering as DH but they're aggressive as hell and sort of a mix between early Slayer and some more extreme thrash.http://www.youtube.com/watch?v=YOtJtyO2ARI

Arachnid is among the best thrash bands who never got past the demo stage and deserve way more love. Very Morbid Saint sounding thrash. Not quite as brutal as Epidemic Of Violence, but that album is about as extreme as thrash can get before it becomes death metal http://www.youtube.com/watch?v=m8A5_Hs-Qzo

Most of the bands listed are fast and brutal and good recommendations but don't really remind me of Demolition Hammer much.

Malevolent Creations has always reminded me of Demolition Hammer though they are a little closer to the death metal side of things. Ten Commandments is a very solid album.http://www.youtube.com/watch?v=OsusVPV5PH4